Very often it is up to the University to provide medical insurance for their students; students cannot enroll in classes without the proof of insurance. Other possibilities include transferring your medical insurance from your home country (if possible, this you must see with your local medical center) or medical insurance offered outside school, there are many in all states that specialize in foreign students and workers.

You must carefully examine what is covered under the insurance and at what percentage (usually you do not get reimbursed the whole amount) and for how long (an academic year, a semester, a calendar year etc.) Costs will vary, but in general will be around $500-$600 per academic year.

Health information
What you need to know about the health care system: the US health care system is a great market as well. It is not covered by the state but it is an individual's choice of organization and services needed. Your university should provide you with a list of possible and best choices for you as an international student living abroad for a limited period of time. The admissions office should provide you with some info when sending you the brochures and applications.